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An administrator is an image that advises the compiler to perform particular scientific or intelligent controls. Objective-C dialect is rich in inherent administrators and gives taking after sorts of administrators:
1. Number juggling Operators
2. Social Operators
3. Sensible Operators
4. Bitwise Operators
5. Task Operators
6. Misc Operators
This exercise will clarify the number juggling, social, intelligent, bitwise, task and different administrators one by one.
iPhone
1. Number juggling Operators
2. Social Operators
3. Sensible Operators
4. Bitwise Operators
5. Task Operators
6. Misc Operators
This exercise will clarify the number juggling, social, intelligent, bitwise, task and different administrators one by one.
Arithmetic Operators
Taking after table demonstrates all the math administrators upheld by Objective-C dialect. Accept variable A holds 10 and variable B holds 20, then:
| Operator | Description | Example |
|---|---|---|
| + | Adds two operands | A + B will give 30 |
| - | Subtracts second operand from the first | A - B will give -10 |
| * | Multiplies both operands | A * B will give 200 |
| / | Divides numerator by denominator | B / A will give 2 |
| % | Modulus Operator and remainder of after an integer division | B % A will give 0 |
| ++ | Increment operator increases integer value by one | A++ will give 11 |
| -- | Decrement operator decreases integer value by one | A-- will give 9 |
Relational Operators
Taking after table demonstrates all the social administrators bolstered by Objective-C dialect. Accept variable A holds 10 and variable B holds 20, then:
| Operator | Description | Example |
|---|---|---|
| == | Checks if the values of two operands are equal or not; if yes, then condition becomes true. | (A == B) is not true. |
| != | Checks if the values of two operands are equal or not; if values are not equal, then condition becomes true. | (A != B) is true. |
| > | Checks if the value of left operand is greater than the value of right operand; if yes, then condition becomes true. | (A > B) is not true. |
| < | Checks if the value of left operand is less than the value of right operand; if yes, then condition becomes true. | (A < B) is true. |
| >= | Checks if the value of left operand is greater than or equal to the value of right operand; if yes, then condition becomes true. | (A >= B) is not true. |
| <= | Checks if the value of left operand is less than or equal to the value of right operand; if yes, then condition becomes true. | (A <= B) is true. |
Logical Operators
Taking after table demonstrates all the consistent administrators bolstered by Objective-C dialect. Expect variable A holds 1 and variable B holds 0, then:
| Operator | Description | Example |
|---|---|---|
| && | Called Logical AND operator. If both the operands are non zero then condition becomes true. | (A && B) is false. |
| || | Called Logical OR Operator. If any of the two operands is non zero then condition becomes true. | (A || B) is true. |
| ! | Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true, then Logical NOT operator will make false. | !(A && B) is true. |
Bitwise Operators
Bitwise administrator deals with bits and perform a tiny bit at a time operation. Reality tables for &, |, and ^ are as per the following:
| p | q | p & q | p | q | p ^ q |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 | 1 |
| 1 | 1 | 1 | 1 | 0 |
| 1 | 0 | 0 | 1 | 1 |
Expect if A = 60; and B = 13; now in double arrangement they will be as per the following:
A = 0011 1100
B = 0000 1101
-
A&B = 0000 1100
A|B = 0011 1101
A^B = 0011 0001
~A = 1100 0011
The Bitwise administrators bolstered by Objective-C dialect are recorded in the accompanying table. Accept variable A holds 60 and variable B holds 13 then:
| Operator | Description | Example |
|---|---|---|
| & | Binary AND Operator copies a bit to the result if it exists in both operands. | (A & B) will give 12, which is 0000 1100 |
| | | Binary OR Operator copies a bit if it exists in either operand. | (A | B) will give 61, which is 0011 1101 |
| ^ | Binary XOR Operator copies the bit if it is set in one operand but not both. | (A ^ B) will give 49, which is 0011 0001 |
| ~ | Binary Ones Complement Operator is unary and has the effect of 'flipping' bits. | (~A ) will give -61, which is 1100 0011 in 2's complement form. |
| << | Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. | A << 2 will give 240, which is 1111 0000 |
| >> | Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand. | A >> 2 will give 15, which is 0000 1111 |
Assignment Operators
| Operator | Description | Example |
|---|---|---|
| = | Simple assignment operator, Assigns values from right side operands to left side operand | C = A + B will assign value of A + B into C |
| += | Add AND assignment operator, It adds right operand to the left operand and assigns the result to left operand | C += A is equivalent to C = C + A |
| -= | Subtract AND assignment operator, It subtracts right operand from the left operand and assigns the result to left operand | C -= A is equivalent to C = C - A |
| *= | Multiply AND assignment operator, It multiplies right operand with the left operand and assigns the result to left operand | C *= A is equivalent to C = C * A |
| /= | Divide AND assignment operator, It divides left operand with the right operand and assigns the result to left operand | C /= A is equivalent to C = C / A |
| %= | Modulus AND assignment operator, It takes modulus using two operands and assigns the result to left operand | C %= A is equivalent to C = C % A |
| <<= | Left shift AND assignment operator | C <<= 2 is same as C = C << 2 |
| >>= | Right shift AND assignment operator | C >>= 2 is same as C = C >> 2 |
| &= | Bitwise AND assignment operator | C &= 2 is same as C = C & 2 |
| ^= | bitwise exclusive OR and assignment operator | C ^= 2 is same as C = C ^ 2 |
| |= | bitwise inclusive OR and assignment operator | C |= 2 is same as C = C | 2 |
Misc Operators ↦ sizeof & ternary
| Operator | Description | Example |
|---|---|---|
| sizeof() | Returns the size of an variable. | sizeof(a), where a is integer, will return 4. |
| & | Returns the address of an variable. | &a; will give actual address of the variable. |
| * | Pointer to a variable. | *a; will pointer to a variable. |
| ? : | Conditional Expression | If Condition is true ? Then value X : Otherwise value Y |
Operators Precedence in Objective-C
Administrator priority decides the gathering of terms in an outflow. This influences how an interpretation is assessed. Certain administrators have higher priority than others; for instance, the duplication administrator has higher priority than the expansion administrator:
Case in point, x = 7 + 3 * 2; here, x is allocated 13, not 20 in light of the fact that administrator * has higher priority than +, so it first gets duplicated with 3*2 and afterward includes into 7.
Here, administrators with the most astounding priority show up at the highest point of the table, those with the least show up at the base. Inside an outflow, higher priority administrators will be assessed first.
| Category | Operator | Associativity |
|---|---|---|
| Postfix | () [] -> . ++ - - | Left to right |
| Unary | + - ! ~ ++ - - (type)* & sizeof | Right to left |
| Multiplicative | * / % | Left to right |
| Additive | + - | Left to right |
| Shift | << >> | Left to right |
| Relational | < <= > >= | Left to right |
| Equality | == != | Left to right |
| Bitwise AND | & | Left to right |
| Bitwise XOR | ^ | Left to right |
| Bitwise OR | | | Left to right |
| Logical AND | && | Left to right |
| Logical OR | || | Left to right |
| Conditional | ?: | Right to left |
| Assignment | = += -= *= /= %=>>= <<= &= ^= |= | Right to left |
| Comma | , | Left to right |
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